aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/bonding/bonding.h
blob: 955dc4839f1d3b03559c69551e4b847571af9c15 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
/*
 * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
 *
 * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
 * NCM: Network and Communications Management, Inc.
 *
 * BUT, I'm the one who modified it for ethernet, so:
 * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU Public License, incorporated herein by reference.
 *
 */

#ifndef _LINUX_BONDING_H
#define _LINUX_BONDING_H

#include <linux/timer.h>
#include <linux/proc_fs.h>
#include <linux/if_bonding.h>
#include <linux/cpumask.h>
#include <linux/in6.h>
#include <linux/netpoll.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include "bond_3ad.h"
#include "bond_alb.h"

#define DRV_VERSION	"3.7.1"
#define DRV_RELDATE	"April 27, 2011"
#define DRV_NAME	"bonding"
#define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"

#define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"

#define BOND_MAX_ARP_TARGETS	16

#define BOND_DEFAULT_MIIMON	100

#define IS_UP(dev)					   \
	      ((((dev)->flags & IFF_UP) == IFF_UP)	&& \
	       netif_running(dev)			&& \
	       netif_carrier_ok(dev))

/*
 * Checks whether slave is ready for transmit.
 */
#define SLAVE_IS_OK(slave)			        \
		    (((slave)->dev->flags & IFF_UP)  && \
		     netif_running((slave)->dev)     && \
		     ((slave)->link == BOND_LINK_UP) && \
		     bond_is_active_slave(slave))


#define USES_PRIMARY(mode)				\
		(((mode) == BOND_MODE_ACTIVEBACKUP) ||	\
		 ((mode) == BOND_MODE_TLB)          ||	\
		 ((mode) == BOND_MODE_ALB))

#define BOND_NO_USES_ARP(mode)				\
		(((mode) == BOND_MODE_8023AD)	||	\
		 ((mode) == BOND_MODE_TLB)	||	\
		 ((mode) == BOND_MODE_ALB))

#define TX_QUEUE_OVERRIDE(mode)				\
			(((mode) == BOND_MODE_ACTIVEBACKUP) ||	\
			 ((mode) == BOND_MODE_ROUNDROBIN))

#define BOND_MODE_IS_LB(mode)			\
		(((mode) == BOND_MODE_TLB) ||	\
		 ((mode) == BOND_MODE_ALB))

#define IS_IP_TARGET_UNUSABLE_ADDRESS(a)	\
	((htonl(INADDR_BROADCAST) == a) ||	\
	 ipv4_is_zeronet(a))
/*
 * Less bad way to call ioctl from within the kernel; this needs to be
 * done some other way to get the call out of interrupt context.
 * Needs "ioctl" variable to be supplied by calling context.
 */
#define IOCTL(dev, arg, cmd) ({		\
	int res = 0;			\
	mm_segment_t fs = get_fs();	\
	set_fs(get_ds());		\
	res = ioctl(dev, arg, cmd);	\
	set_fs(fs);			\
	res; })

/* slave list primitives */
#define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)

#define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))

/* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
#define bond_first_slave(bond) \
	(bond_has_slaves(bond) ? \
		netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
		NULL)
#define bond_last_slave(bond) \
	(bond_has_slaves(bond) ? \
		netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
		NULL)

/* Caller must have rcu_read_lock */
#define bond_first_slave_rcu(bond) \
	netdev_lower_get_first_private_rcu(bond->dev)

#define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
#define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))

/**
 * bond_for_each_slave - iterate over all slaves
 * @bond:	the bond holding this list
 * @pos:	current slave
 * @iter:	list_head * iterator
 *
 * Caller must hold bond->lock
 */
#define bond_for_each_slave(bond, pos, iter) \
	netdev_for_each_lower_private((bond)->dev, pos, iter)

/* Caller must have rcu_read_lock */
#define bond_for_each_slave_rcu(bond, pos, iter) \
	netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)

#ifdef CONFIG_NET_POLL_CONTROLLER
extern atomic_t netpoll_block_tx;

static inline void block_netpoll_tx(void)
{
	atomic_inc(&netpoll_block_tx);
}

static inline void unblock_netpoll_tx(void)
{
	atomic_dec(&netpoll_block_tx);
}

static inline int is_netpoll_tx_blocked(struct net_device *dev)
{
	if (unlikely(netpoll_tx_running(dev)))
		return atomic_read(&netpoll_block_tx);
	return 0;
}
#else
#define block_netpoll_tx()
#define unblock_netpoll_tx()
#define is_netpoll_tx_blocked(dev) (0)
#endif

struct bond_params {
	int mode;
	int xmit_policy;
	int miimon;
	u8 num_peer_notif;
	int arp_interval;
	int arp_validate;
	int arp_all_targets;
	int use_carrier;
	int fail_over_mac;
	int updelay;
	int downdelay;
	int lacp_fast;
	unsigned int min_links;
	int ad_select;
	char primary[IFNAMSIZ];
	int primary_reselect;
	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
	int tx_queues;
	int all_slaves_active;
	int resend_igmp;
	int lp_interval;
	int packets_per_slave;
};

struct bond_parm_tbl {
	char *modename;
	int mode;
};

#define BOND_MAX_MODENAME_LEN 20

struct slave {
	struct net_device *dev; /* first - useful for panic debug */
	struct bonding *bond; /* our master */
	int    delay;
	unsigned long jiffies;
	unsigned long last_arp_rx;
	unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
	s8     link;    /* one of BOND_LINK_XXXX */
	s8     new_link;
	u8     backup:1,   /* indicates backup slave. Value corresponds with
			      BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
	       inactive:1; /* indicates inactive slave */
	u8     duplex;
	u32    original_mtu;
	u32    link_failure_count;
	u32    speed;
	u16    queue_id;
	u8     perm_hwaddr[ETH_ALEN];
	struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
	struct tlb_slave_info tlb_info;
#ifdef CONFIG_NET_POLL_CONTROLLER
	struct netpoll *np;
#endif
};

/*
 * Link pseudo-state only used internally by monitors
 */
#define BOND_LINK_NOCHANGE -1

/*
 * Here are the locking policies for the two bonding locks:
 *
 * 1) Get bond->lock when reading/writing slave list.
 * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 *    (It is unnecessary when the write-lock is put with bond->lock.)
 * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 *    beforehand.
 */
struct bonding {
	struct   net_device *dev; /* first - useful for panic debug */
	struct   slave *curr_active_slave;
	struct   slave *current_arp_slave;
	struct   slave *primary_slave;
	bool     force_primary;
	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
	int     (*recv_probe)(const struct sk_buff *, struct bonding *,
			      struct slave *);
	rwlock_t lock;
	rwlock_t curr_slave_lock;
	u8	 send_peer_notif;
	u8       igmp_retrans;
#ifdef CONFIG_PROC_FS
	struct   proc_dir_entry *proc_entry;
	char     proc_file_name[IFNAMSIZ];
#endif /* CONFIG_PROC_FS */
	struct   list_head bond_list;
	u32      rr_tx_counter;
	struct   ad_bond_info ad_info;
	struct   alb_bond_info alb_info;
	struct   bond_params params;
	struct   workqueue_struct *wq;
	struct   delayed_work mii_work;
	struct   delayed_work arp_work;
	struct   delayed_work alb_work;
	struct   delayed_work ad_work;
	struct   delayed_work mcast_work;
#ifdef CONFIG_DEBUG_FS
	/* debugging support via debugfs */
	struct	 dentry *debug_dir;
#endif /* CONFIG_DEBUG_FS */
};

#define bond_slave_get_rcu(dev) \
	((struct slave *) rcu_dereference(dev->rx_handler_data))

#define bond_slave_get_rtnl(dev) \
	((struct slave *) rtnl_dereference(dev->rx_handler_data))

/**
 * Returns NULL if the net_device does not belong to any of the bond's slaves
 *
 * Caller must hold bond lock for read
 */
static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
						  struct net_device *slave_dev)
{
	return netdev_lower_dev_get_private(bond->dev, slave_dev);
}

static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
{
	if (!slave || !slave->bond)
		return NULL;
	return slave->bond;
}

static inline bool bond_is_lb(const struct bonding *bond)
{
	return BOND_MODE_IS_LB(bond->params.mode);
}

static inline void bond_set_active_slave(struct slave *slave)
{
	slave->backup = 0;
}

static inline void bond_set_backup_slave(struct slave *slave)
{
	slave->backup = 1;
}

static inline int bond_slave_state(struct slave *slave)
{
	return slave->backup;
}

static inline bool bond_is_active_slave(struct slave *slave)
{
	return !bond_slave_state(slave);
}

#define BOND_PRI_RESELECT_ALWAYS	0
#define BOND_PRI_RESELECT_BETTER	1
#define BOND_PRI_RESELECT_FAILURE	2

#define BOND_FOM_NONE			0
#define BOND_FOM_ACTIVE			1
#define BOND_FOM_FOLLOW			2

#define BOND_ARP_TARGETS_ANY		0
#define BOND_ARP_TARGETS_ALL		1

#define BOND_ARP_VALIDATE_NONE		0
#define BOND_ARP_VALIDATE_ACTIVE	(1 << BOND_STATE_ACTIVE)
#define BOND_ARP_VALIDATE_BACKUP	(1 << BOND_STATE_BACKUP)
#define BOND_ARP_VALIDATE_ALL		(BOND_ARP_VALIDATE_ACTIVE | \
					 BOND_ARP_VALIDATE_BACKUP)

static inline int slave_do_arp_validate(struct bonding *bond,
					struct slave *slave)
{
	return bond->params.arp_validate & (1 << bond_slave_state(slave));
}

/* Get the oldest arp which we've received on this slave for bond's
 * arp_targets.
 */
static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
						       struct slave *slave)
{
	int i = 1;
	unsigned long ret = slave->target_last_arp_rx[0];

	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
		if (time_before(slave->target_last_arp_rx[i], ret))
			ret = slave->target_last_arp_rx[i];

	return ret;
}

static inline unsigned long slave_last_rx(struct bonding *bond,
					struct slave *slave)
{
	if (slave_do_arp_validate(bond, slave)) {
		if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
			return slave_oldest_target_arp_rx(bond, slave);
		else
			return slave->last_arp_rx;
	}

	return slave->dev->last_rx;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static inline void bond_netpoll_send_skb(const struct slave *slave,
					 struct sk_buff *skb)
{
	struct netpoll *np = slave->np;

	if (np)
		netpoll_send_skb(np, skb);
}
#else
static inline void bond_netpoll_send_skb(const struct slave *slave,
					 struct sk_buff *skb)
{
}
#endif

static inline void bond_set_slave_inactive_flags(struct slave *slave)
{
	if (!bond_is_lb(slave->bond))
		bond_set_backup_slave(slave);
	if (!slave->bond->params.all_slaves_active)
		slave->inactive = 1;
}

static inline void bond_set_slave_active_flags(struct slave *slave)
{
	bond_set_active_slave(slave);
	slave->inactive = 0;
}

static inline bool bond_is_slave_inactive(struct slave *slave)
{
	return slave->inactive;
}

static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
{
	struct in_device *in_dev;
	__be32 addr = 0;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(dev);

	if (in_dev)
		addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
					 RT_SCOPE_HOST);
	rcu_read_unlock();
	return addr;
}

static inline bool slave_can_tx(struct slave *slave)
{
	if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP &&
	    bond_is_active_slave(slave))
		return true;
	else
		return false;
}

struct bond_net;

int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
int bond_create(struct net *net, const char *name);
int bond_create_sysfs(struct bond_net *net);
void bond_destroy_sysfs(struct bond_net *net);
void bond_prepare_sysfs_group(struct bonding *bond);
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count);
int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
int bond_parm_tbl_lookup(int mode, const struct bond_parm_tbl *tbl);
void bond_select_active_slave(struct bonding *bond);
void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
void bond_create_debugfs(void);
void bond_destroy_debugfs(void);
void bond_debug_register(struct bonding *bond);
void bond_debug_unregister(struct bonding *bond);
void bond_debug_reregister(struct bonding *bond);
const char *bond_mode_name(int mode);
void bond_setup(struct net_device *bond_dev);
unsigned int bond_get_num_tx_queues(void);
int bond_netlink_init(void);
void bond_netlink_fini(void);
int bond_option_mode_set(struct bonding *bond, int mode);
int bond_option_active_slave_set(struct bonding *bond, struct net_device *slave_dev);
int bond_option_miimon_set(struct bonding *bond, int miimon);
int bond_option_updelay_set(struct bonding *bond, int updelay);
int bond_option_downdelay_set(struct bonding *bond, int downdelay);
int bond_option_use_carrier_set(struct bonding *bond, int use_carrier);
int bond_option_arp_interval_set(struct bonding *bond, int arp_interval);
int bond_option_arp_ip_targets_set(struct bonding *bond, __be32 *targets,
				   int count);
int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target);
int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target);
int bond_option_arp_validate_set(struct bonding *bond, int arp_validate);
int bond_option_arp_all_targets_set(struct bonding *bond, int arp_all_targets);
int bond_option_primary_set(struct bonding *bond, const char *primary);
int bond_option_primary_reselect_set(struct bonding *bond,
				     int primary_reselect);
int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac);
int bond_option_xmit_hash_policy_set(struct bonding *bond,
				     int xmit_hash_policy);
int bond_option_resend_igmp_set(struct bonding *bond, int resend_igmp);
int bond_option_num_peer_notif_set(struct bonding *bond, int num_peer_notif);
int bond_option_all_slaves_active_set(struct bonding *bond,
				      int all_slaves_active);
int bond_option_min_links_set(struct bonding *bond, int min_links);
int bond_option_lp_interval_set(struct bonding *bond, int min_links);
int bond_option_packets_per_slave_set(struct bonding *bond,
				      int packets_per_slave);
int bond_option_lacp_rate_set(struct bonding *bond, int lacp_rate);
int bond_option_ad_select_set(struct bonding *bond, int ad_select);
struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
struct net_device *bond_option_active_slave_get(struct bonding *bond);

struct bond_net {
	struct net *		net;	/* Associated network namespace */
	struct list_head	dev_list;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry *	proc_dir;
#endif
	struct class_attribute	class_attr_bonding_masters;
};

#ifdef CONFIG_PROC_FS
void bond_create_proc_entry(struct bonding *bond);
void bond_remove_proc_entry(struct bonding *bond);
void bond_create_proc_dir(struct bond_net *bn);
void bond_destroy_proc_dir(struct bond_net *bn);
#else
static inline void bond_create_proc_entry(struct bonding *bond)
{
}

static inline void bond_remove_proc_entry(struct bonding *bond)
{
}

static inline void bond_create_proc_dir(struct bond_net *bn)
{
}

static inline void bond_destroy_proc_dir(struct bond_net *bn)
{
}
#endif

static inline struct slave *bond_slave_has_mac(struct bonding *bond,
					       const u8 *mac)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave(bond, tmp, iter)
		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
			return tmp;

	return NULL;
}

/* Caller must hold rcu_read_lock() for read */
static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
					       const u8 *mac)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave_rcu(bond, tmp, iter)
		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
			return tmp;

	return NULL;
}

/* Check if the ip is present in arp ip list, or first free slot if ip == 0
 * Returns -1 if not found, index if found
 */
static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
{
	int i;

	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
		if (targets[i] == ip)
			return i;
		else if (targets[i] == 0)
			break;

	return -1;
}

/* exported from bond_main.c */
extern int bond_net_id;
extern const struct bond_parm_tbl bond_lacp_tbl[];
extern const struct bond_parm_tbl bond_mode_tbl[];
extern const struct bond_parm_tbl xmit_hashtype_tbl[];
extern const struct bond_parm_tbl arp_validate_tbl[];
extern const struct bond_parm_tbl arp_all_targets_tbl[];
extern const struct bond_parm_tbl fail_over_mac_tbl[];
extern const struct bond_parm_tbl pri_reselect_tbl[];
extern struct bond_parm_tbl ad_select_tbl[];

/* exported from bond_netlink.c */
extern struct rtnl_link_ops bond_link_ops;

#endif /* _LINUX_BONDING_H */